Vertical water-tube boiler



(No Model.)

MILLER. VERTICAL WATERIUBE BOILER. I I -No. 567,913. Patented Sept. 15,1896.

w/r/mss; %%@2 W242 INVENTOR UNITED STAT PATENT FricE.

MATHIASrMILLER, OF AUBURN, INDIANA.

VERATICAL WATER-TUBE BOILER.

SPECIFICATION forming part of Letters Patent No. 567,913, datedSeptember 15, 1896.

Application filed May 28, 1896. Serial No. 593,384. (No model.)

To all whom it may concern-.-

Be it known that I, MA'rHIAs MILLER, a citi to the accompanyingdrawings, which form part of this specification.

My invention relates to an improvement in vertical water-tube boilersdesigned to utilize the waste heat from furnaces and by presenting anextended heating-surface in contact with the water to quickly andeconomically generate steam. s

The object of my invention is also to pro vide a steam-generator formarine and stationary engines having a large area of heat ing-surface,and which can be placed in a plant without the necessity of buildingbrick arches or to incase the boiler with brick.

A further object is to arrange the watertubes in connection with aninner waterdrum to secure the best circulation of heat within theboiler. a

i I accomplish these objects by the device described in the followingspecification, and illustrated by the accompanying drawings, in which IFigure l is a view in vertical section of the boiler embodying myinvention. Fig. 2 is a transverse sectional view ofFig. 1 through theline a: w, and Fig. 3 is a transverse sectional view through the line NN.

Similar figures refer to similar parts in the several views. a

The small numeral 1 represents the outer shell of the boiler,cylindrical in form and resting upon a brick foundation 31 and having acrown-shell 18.

2 is an inner shell concentric with the outer shell 1.

Both the outer and inner shell have a cir cular central opening at thebottom, inclosed by the cylindrical casing 32, which is united to thebase 25 of the outer shell at the bottom and to the base 33 of the innershell at the top, thus practically forming a part of the boiler and asupport for the inner shell, with a water-space .3 between the two.bottoms, which communicates with and forms an exten- 5 5 sion of thewater-space 3 between the sides of the two shells.

The tops or crowns of both the inner and outer shells have centralcircular openings for a smoke-flue 17, which is united at its base tothe crown 30 of the inner shell, and at its top to the crown 18 of theouter shell, thus affording a draft-opening from the interior for theescape of the smoke.

Above the ash-pit 8 at the base of the boiler are the fire-grates 6 andthe firebox 7.

9 is a cylindrical inner drum suspended midway between the top andbottom of the boiler, having a bottom 10, a crown 1 1, and verticalsides 21. 7o

28 is a ring or sleeve which is riveted to the drum 9 and the wall ofthe shell 2 and open in its center and thereby giving a freecommunication between the water-space 3 and the interior of the drum 9.w

Secured to the bottom 33 of the shell 2 in concentric rows around thefire-grates are the water-tubes 12, which are preferably inclinedinwardly at their upper ends, where they are united to the bottom 10 ofthe drum 9. These tubes communicate at their lower ends with thewater-space 3 and at their upper ends with the interior of the drum 9.Above this drum are also a plurality of concentric rows ofwater-tubes12, secured at their lower ends to the crown 11 andpreferably inclining outwardly, also secured at their upper ends in thecrown 30, and thus communicate with the interior of the drum 9 and thewater-space above the crown 30.

The drum 9 is less in diameter than the inner diameter of the shell 2,thus leaving a space between their walls for the ascent of the heat fromthe fire below the drum to the spaces 29 above the same and having thedraft-exit through the flue 17.

Above the crown of the drum 9 a circular angle-iron 24 is secured to theinner wall of the shell 2 to deflect the heat as it rises around theexterior of the drum toward the center of the inner space of the boiler.This erable.

boiler opposite the opening through the ring 28, Which has a manholedoor or plate 34, secured in the outer shell by the ordinary bridge andbolt, so as to make it water-tight. Through the opening 20 and thecoincident opening through the ring 28 a free access is afforded to theinterior of the drum 9 for the purpose of cleaning and repairing thesaid drum when the water is drawn from the boiler.

22 is a blow-off pipe communicating with the bottom of the drum 9 andprojecting at its outer end through a sleeve 35. to the outside of theboiler. The sleeve 35 is secured to the outer and inner shells of theboiler so as to be water-tight.

2 3 is an ordinary fire-door mounted within the, solid ring 27, whichring is also secured to the outer and inner shells. Bythis means accessis given to the fire-box and there is free communication between thewater-space below and above the fire-door around the eX- terior of thering 27.

13 is a metallic cone suspended centrallyin the shell 2 by a rod orchain 14 from the lever 15,, pivoted upon the standard 16. This. conedivides the heated air in its ascent, and it is thus diffused among theupper tubes l2, and by raising it against the base of the flue 17 orlowering it it regulates the draft.

l9 a manhole, in the crown 18, secured by a manhole-plate in the usualmanner.

29 and 29, are hot-air spaces in the interior of the inner shell.

26 is wash-out plug at the base of the boiler and there can beany-number of them placed at different points in the outercircumference.

The dotted line 5 indicates the height of the water above the top of thecrown 30, which of course can be varied, and 4 is the steamspace abovethe water-line.

'By this construction it will be perceived that the water fills theentire space between the outer and inner shells up to and covering thetop of the inner shell and also fills the upper and lower series oftubes 12 and the drum 9.

In very large boilers central draft-tubes may also be made through thedrum 9 for the heated air to ascend from the fire to the airspace abovethe drum.

By this device a very equal distribution of the heat is secured and thehot air surrounds the water-tubes and the drum as well as givfi ing aheating-surface to the whole of the inner shell. No. brick walls orcasingare necessary for inclosing the boiler. The fire-grate surface maybe quite small and a great saving of fuel effected. The boiler can bemade ready for use in the shop before shipping and can be set for use byany ordinary mechanic.

Having thus described myinvention, what I claim as new, and desire tosecure by Letters Patent, is-T 1. In a vertical water-tube boiler thecombination of an external and an inner shell having a water-spacebetween the shells at the bottom, sides, and top, and having a centralcircular opening at the base for an ashpit, a fire-box above theash-pit, a central circular water-drum suspended midway between the baseand the top of the inner shell of less diameter than the interiordiameter of the inner shell, a plurality of concentric rows ofwater-tubes communicating with the waterspace beneath the bottom plateof the inner shell and the interior of the said water-drum andsupporting said drum, a plurality of concentric rows of water-tubesconnected at their lower ends with the crown of the said waterdrum andat their upper ends with the crown of the said inner shell therebyforming a water communication between the water=space in the interior ofsaid drum and the space above the crown of the inner shell, a centralvertical flue connected with and opening through the crown-sheets ofboth the outer and inner shells into the heat-chamber in the interior ofthe boiler and an inverted conical damper adapted to close said fluewith means for regulating said damper all arranged as shown anddescribed.

2. In a vertical water-tube boiler, the com bination of an externalcylindrical shell and an inner concentric cylindrical shell having awater-space between them, a fire-box in the interior of the, base ofsaid boiler, with means to feed fuel into said fire-box through an opening in said shells, a central circular waterdrum suspended midwaybetween the base and the top of the said inner shell and having a lessdiameter than the said inner shell and having communication bywater-tubes between thewater-space, at the lowerpart of the inner shelland the interior of said drum, a plurality of water tubes connecting attheir lower ends with the said water-drum, and at their upper ends withthe water-space between the outer and inner shells, a central verticalflue com municating with the hot-air space of the inner shell,.adraft-damper adapted to regulate the draft and diiiuse the heat in thesaid airchamber, a steam-chest. above the water-lines in said boiler,and means for communicating with said steam-chest, and also means forcommunicating with said inner drum from the exterior all arranged asshown and de, scribed and for the purpose stated.

3. In a vertical water-tube, boiler, the combination of an outer shell,an inner concentric shell so .arranged as to leave a water-space betweenit and the outer shell, a smoke-flue and draft-damper as shown, acentrally-arranged inner water-drum suspended as shown and connectingwith said waterspace by a series of fixed water+tubes arranged asdescribed and the said inner drum being provided with a suitable openingcoin, cident with an adjacent manhole, thereby affording access from theexterior to the interior of said inner drum for cleaning and repairs,all substantially as. described and shown and for the purpose stated.

at. In a vertical Water-tube boiler an inner terior to the interior ofsaid drum for clean- 10 heating-drum centrally fixed in an inner heatingand repairs. ing or furnace shell and communicating With Dated at FortWayne, Indiana, this 25th the Water-spaces surrounding said shell by aday of May, 1896. 1 series of fixed Water-tubes constructed and arrangedas described, the said drum being provided with a suitable openingcoincident Witnesses: with an adjacent manhole of the heating- ALBERT L.BOND, shell, thereby aflording access from the eX- HENRY J. MILLER.

MATI-IIAS MILLER.

